Chuck



FIG. 1 is a perspective view of a chuck showing my new design;

FIG. 2 is a right side elevational view thereof, the left side elevational view being symmetrical to the right side view;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The broken lines are for illustrative purposes only and form no part of the invention. 

The ornamental design for a chuck, as shown and described. 